Ventilator



June 4, 1929. E, w, FRENDAHL 1,716,223

VENTILATOR Filed sept. 19, 1927 l l 7j f4 y@ 'j l y 2 Z5 I a y 2 r1 n 201%; I ff/fl- ".7""`

v if l ,e5 ff f/Md We/zcl ATTORNEY CII Patented June 4, 1929.

f maris EDWARD W. FRFNDAHL, OF CHICAGO, LLINOIS.

VENTILATOR.

Application filed September 19, 1927. Serial No. 220,609. f

This invention relates to certain novel improvements in ventilators andhas for its principal object the provision of an improved constructionof this character which will be highly efficient in use and economicalin manufacture.

Among the several objects of the invention resides in the novel mannerof associating the parts of the ventilator together.

Further objects of the invention are to provide a ventilator which willprevent the usual downdraft and create what might be termed a siphoningeffect of air whereby to properly ventilate a room or building withwhich it is associated.

Other objects will appear hereinafter.

The invention consists in the novel combination and arrangement of partsto be hereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawings, showing the preferred form of construction and in which:

Fig. 1 is a part sectional side elevational view of the invention; and

Fig. 2 is a. sectional detail view taken substantially on line 2-2 ofFig. 1.

l My improved ventilator includes a duct 10. This duct 10 is conical inshape and has its lower end portion 11 formed substantially cylindricaland its upper end portion substantially square as at 12 whereby theupper end portion provides an expansion chamber for air moving upwardlythrough the duct. The upper end portion of the duct projects into afrustum 13 and is secured thereto by means of rivets 14 or the like. Theupper end portion of the frustum projects into a ring 15 spaced from theside wall portions of the frustum by means of brackets 16. rllhesebrackets 16 have their upper end portions secured to the top edge of thefrustum by means of rivets 18 or the like. The brackets 16 includehorizontal portions 19 secured to the pilng through the medium of rivets2O or'the A cap of a frustro-conical shape is indicated at 21 and thelower portion of the cap projects into the ring 15. rilhe brackets 16provide upwardly inclined end portions 22 and to these end portions issecured the peripheral edge 23 of the cap as at 24, said peripheraledges being spaced from the ring so as to provide a substantial passage.

I have found by forming the duct 10 cylindrical at its lower end portionand square;

at its upper end portion that the usual back draft is eliminated and asthe air passes upwardly through this duct a siphoning effect is created,thus properly functioning as a ventilator.

The several parts of the ventilator may have their peripheral edgescorrugated as at 25 whereby to re-enforce the several parts of theventilator,

From the above description taken in connection with the accompanyingdrawing it will be seen that I provide a ventilator which is not onlyeii'ective in use but which com prises parts connected together in asimple and expeditious manner.

llVhile l have illustrated and described the preferred form ofconstruction for carrying iny invention into effect, this is capable ofvariation and modification, without departing from the spirit of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set forth, but

desire to avail myself of such variations and modifications as comevwithin the scope of the appended claims. 1 y y Having thus described myinvention what I claim as new and ters Patent is: f

1. A. ventilator including a duct having a lower end portionsubstantially cylindrical and an upper end portion formed substantiallysquare, a frustum into which the square end portion of the ductprojects, means for connecting the corners of said duct to the frustumwhereby openings are provided between the upper end of the duct and thefrustum, a ring into which the upper end portion of the fr ustuniprojects, a cap having its lower edge portion projecting into the ringabove the frustum, the cap to the ring and to the frustum. 'j

2. A ventilator including a duct having a lower end portionsubstantially cylindrical and an upper end portion formed substantiallysquare, a frustuin into which the square end portion of the ductprojects, means ior connecting the corners of the duct to the frustumwhereby openings are provided between the upper end ring into which theupper end portion of the frustum projects, a cap havingits lower edgeportion projecting into the ring above the frustum, and brackets forconnecting the cap to the ring and the ring to the frustuni.

3. A ventilator including a substantially conically Shaped duct havingthe smaller low-l desire to protect by Letand means for connecting ofthe duct and the frustum, a f

er end thereof forniedsubstantial-ly circular and having the largerupper end thereof formed substantially square, e frustum, means forconnecting the Corner portions of seid duct to said frustum whereby thesmallerlower end of said duct will project be,- yond the lower end ofsaid rustum and whereby segmental openings will be defined by theportions of said duct extending bel@ tween said securedV corner portionsand copoint in the extent thereof, and bracket inembers for securing theupper portion of said frustuin in said ring below said cap and in spacedrela-tion thereto.

In testimony whereof I affix my signature.'

EDWARD WV. FRENDAHL.

